Actually the Agile Network is completely free for any one to use in what concerns

the OutSystems Agile Academy - here you can get full Training & Certification as a Developer

the OutSystems TechCenter - where all the community activity takes place including the Forums, the Components and Agile Platform related downloads

On the other hand there are indeed two levels of paid service mostly target at companies using the Agile Platform. These are the Team and the Team Plus editions, which mostly add functionality regarding